ZF 4699.303.189 SHIM RING | OEM Genuine Part

Overview

The ZF 4699.303.189 SHIM RING (SKU: 4699.303.189) is a precision-engineered OEM genuine component designed for axial clearance adjustment within heavy-duty ZF transmissions used in construction machinery. This hardened steel ring sits between the planetary gear set and the housing assembly, ensuring correct preload on bearings and shafts. By maintaining exact tolerances, it prevents excessive end-play that can lead to gear misalignment. This shim ring is frequently installed alongside the 4699101046 HOUSING and the 4699301109 HOUSING to secure the internal rotating assembly. Without this shim, the transmission cannot achieve the precise load distribution required for long service life under high torque conditions.

Symptoms of Failure

• Transmission gear slipping under load: A worn or collapsed shim ring allows axial movement, causing gears to lose engagement during heavy operation.
• Abnormal bearing noise or vibration: Incorrect shim thickness leads to bearing preload loss, producing a distinct rumbling or whining sound from the transmission housing.
• Oil leaks at housing mating surfaces: When the shim ring fails, the 4699301017 BEARING COVER and 4699301085 COVER may shift, breaking the seal and allowing fluid to escape.
• Hard shifting or delayed engagement: Excessive end-play from a degraded shim ring disrupts clutch pack clearance, making gear changes sluggish or erratic.

Technical Specifications

Compatibility

This shim ring is primarily used in ZF WG180, WG200, and WG211 series transmissions commonly found in wheel loaders, excavators, and telehandlers. It also fits select ZF Ecomat 4HP and 5HP models where axial shimming of the planetary carrier is required. Always verify the part number against your transmission’s parts manual, as shim thickness varies by application. The ring works in conjunction with the 0634303141 O-RING and 0634309600 SHAFT SEAL to ensure a leak-free assembly.

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